1151B1 and 1151B2 Power Supplies
Issue 3 January 2008 133
!CAUTION:
CAUTION: The power supply can be used only with telecommunications equipment, indoors,
and in a controlled environment.
The power supply has a single output of -48 VDC, 0.4 amperes and can operate from either a
120 VAC 60 hertz power source (105 to 129 VAC) or a 220/230/240 VAC 50hertz power source
(198 to 264 VAC). Input voltage selection is automatic. The output capacity is 19.2 watts.
The power supply can be placed on a flat surface such as a desk. For wall-mounting, keyhole
slots are provided on the bottom of the chassis.
!CAUTION:
CAUTION: Do not locate the unit within 6 inches (15 centimeters) of the floor.
Connecting the 1151B1 or 1151B2 Power Supplies The 1151B1 is a standard (no battery backup) power supply unit. The 1151B2 is a battery
backup version of the 1151B1. Either power supply can support one telephone with or without
an adjunct. The maximum loop range is 250 feet (76 meters). Two modular jacks are used.
Power is provided on the PHONE jack, pins 7 and 8 (- and +, respectively).
The PHONE and LINE jacks are 8-pin female nonkeyed 657-type jacks that can accept D4, D6,
and D8 modular plug cables. See an Figure 59: 1151B2 Power Supply — fronton page 133.
Figure 59: 1151B2 Power Supply — front
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